Connected: An Internet Encyclopedia
RFC 1521 - 7.2.6. Other Multipart subtypes

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### 7.2.6. Other Multipart subtypes

Other multipart subtypes are expected in the future. MIME implementations must in general treat unrecognized subtypes of multipart as being equivalent to "multipart/mixed".

The formal grammar for content-type header fields for multipart data is given by:

       multipart-type := "multipart" "/" multipart-subtype
                      ";" "boundary" "=" boundary
       multipart-subtype := "mixed" / "parallel" / "digest"
                      / "alternative" / extension-token

Next: 7.3. The Message Content-Type

Connected: An Internet Encyclopedia
RFC 1521 - 7.2.6. Other Multipart subtypes